class Point {
	int x,y;
	void setXY(int m,int n) {
		x = m;
		y = n;
	}
}
public class Example4_4 {
	public static void main(String args[]) {
		Point p1,p2;
		p1 = new Point();
		p2 = new Point();
		System.out.println("p1 的引用"+p1);
		System.out.println("p2 的引用"+p2);
		p1.setXY(1111,2222);
		p2.setXY(-100,-200);
		System.out.println("p1的x,y坐标:"+p1.x+","+p1.y);
		System.out.println("p2的x,y坐标:"+p2.x+","+p2.y);
		p1 = p2;
		System.out.println("将p2的引用赋给p1后：");
		System.out.println("p1的引用"+p1);
		System.out.println("p2的引用"+p2);
		System.out.println("p1的x,y坐标"+p1.x+","+p1.y);
		System.out.println("p2的x,y坐标"+p2.x+","+p2.y);
	}
}
